Carbon graphite valve seat component and processing method thereof

Abstract

The invention relates to a carbon graphite valve seat component. The carbon graphite valve seat component comprises a valve seat, wherein the valve seat is arranged between a ball and a valve body, an embedded type carbon graphite valve seat is arranged in the valve seat, a double shaping graphite fire protection structure is arranged on the edge of the valve seat, on the periphery of the embedded type carbon graphite valve seat, an interval is arranged between the embedded type carbon graphite valve seat and the ball, seal faces are formed on two sides of the interval, and a scraper is installed on each seal face. The invention further discloses a processing method of the carbon graphite valve seat component. The carbon graphite valve seat component has the advantages of being formed through innovation based on a valve seat of a top assembling type wedge ball valve, and in a structure formed by combining a carbon graphite and special material alloy ring composite member with the carbon graphite embedded type special alloy valve seat which is used as a valve seat of a DDB (double block and bleed) ball valve, achieving the purpose of meeting special requirements of PTA industry media, being high in medium temperature, obtaining strong causticity and the like.

Description

technical field [0001] The invention relates to a carbon graphite valve seat component with high medium temperature and strong corrosion, which can meet the special requirements of the medium in the PTA industry and a processing method thereof. Background technique [0002] With the increasing development of the domestic PTA industry, the localization of some special imported valves on the PTA device is also imperative. Due to the particularity of the medium on the PTA device (high temperature, strong corrosion, etc.), the material selection of the valve on the PTA pipeline must not only have corrosion resistance but also high temperature resistance, so the material selection for the valve is the key. The test of the valve industry. Therefore, it is necessary to continuously develop and explore new materials and new structures, combined with the specifications of ball valves produced and maintained for projects such as Yisheng, Huisheng, Jiaxing Petrochemical, Far East Petr...

AI Technical Summary

Problems solved by technology

[0006] Since there is a certain difference in the thermal expansion coefficients of the two, as the temperature of the PTA device changes (-29 to 200°C), such as figure 1 , the contact surface A and the contact surface B will have two situations of too tight connection and too loose connection. If the connection is too tight, the carbon graphite sealing ring will be crushed and damaged. If the connection is too loose, the valve will leak, and even the carbon graphite sealing ring and Titanium ring detached from damage

[0007] In view of the above two situations, a new solution is needed. One solution is to use the heat sleeve method in China, that is, put the heated titanium ring on the static carbon graphite sealing ring, and wait for the titanium ring and carbon graphite to cool down to normal temperature. Finally, the two achieve an interference fit, and then they can be processed and assembled; when installed on the PTA pipe, as the temperature rises to 200 ° C, due to the large difference in thermal expansion coefficient between the two, the titanium ring increases with the temperature. If the thermal expansion is greater than the thermal expansion of carbon graphite, "too loose connection" will occur, which will lead to valve leakage, and even the carbon graphite sealing ring and titanium ring will be separated;

[0008] Another solution is to adopt the method of cold sleeve, that is, put the cooled carbon graphite sealing ring into the static titanium ring, and wait for the titanium ring and carbon graphite to cool to normal temperature, and the two can also achieve interference fit, so that they can be processed. Similarly, when installed on PTA pipes, as the temperature rises to 200°C, due to the large difference in thermal expansion coefficients between the two, the above "too loose connection" will occur again; similarly, both solutions are Not advisable

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